This research aims to develop weblog as media in teaching writing of senior high school students. It is a research and development (R&D) study that follows ASSURE model proposed by Heinrich and developed by Smaldino, Heinich, Molenda, & Russell (2005:49). The procedure of developing media consisted of analyzing learner, stating objective, selecting media, utilizing media, requiring learner participation, evaluating and revising. The product was examined by the media expert. After conducting the first test, the second test was conducted by English teacher and students. The subjects of this research were the eleventh grade students of PGN 1 High school. The subject consisted of 19 students of class XI. The researcher used an interview and q...